The front of the mask is dominated by a large exhale valve which combines a speech diaphragm: Note the red fibre disc secured to the front with a split ring, this would have the owners details written on. The S10 is similar to its predecessor in general form, having a side mounted canister, but is a far more sophisticated design and made of a harder rubber than the earlier model: The rubber is extremely durable and has a service life of twenty years. In 1986 the British Army started replacing the S6 respirator ( here) with a new S10 respirator.
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May 2023
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